The Study on Refining Calcium Carbonation with Lime Mud from Reed Pulp Black Liquor as Filler for Papermaking

Abstract

The different refining processes of lime mud, including water washing, drying and adding auxiliaries from chemical recovery of black liquor from reed pulp mill were studied in the article. The convenient and effective technologies of refining lime mud for CaCO3used as papermaking fillers with less water consumption were optimized and discussed. The experimental results showed that the brightness of the CaCO3refined is 84~86%(ISO), and water consumption is about 30~50 ton for one ton’s lime mud by the washing processes, and the brightness of the CaCO3refined is 88~89%(ISO) by the drying processes, and the lowest water consumption is about 3~6 tons for one ton’s lime mud by the adding auxiliaries peocess. With the optimum process, the carbonizing temperature is about 50°C, and the brightness of CaCO3refined is 91.5%(ISO). Total water consumption in the processes is only about 5~10 tons for one ton lime mud.